package com.sq.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.sq.common.to.es.SkuEsModel;
import com.sq.common.utils.R;
import com.sq.gulimall.search.config.GulimallElasticSearchConfig;
import com.sq.gulimall.search.constant.EsConstant;
import com.sq.gulimall.search.feign.ProductFeignService;
import com.sq.gulimall.search.service.MallSearchService;
import com.sq.gulimall.search.vo.AttrResponseVo;
import com.sq.gulimall.search.vo.BrandVo;
import com.sq.gulimall.search.vo.SearchParam;
import com.sq.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam searchParam) {
        // 1.动态构建出查询需要的DSL语句
        SearchResult result = null;

        //1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(searchParam);

        try {
            //2.执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //3.分析响应数据，封装成我们需要的格式
            result = buildSearchResult(response,searchParam);
        } catch (IOException e) {
                e.printStackTrace();
        }

        return result;
    }

    /**
     * 准备检索请求
     * 模糊匹配， 过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam searchParam) {
        //构建DSL语句的
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        /**
         *模糊匹配， 过滤（按照属性，分类，品牌，价格区间，库存）
         */
        // 1.构建bool - query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        // 1.1 must - 模糊匹配
        if(!StringUtils.isEmpty(searchParam.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",searchParam.getKeyword()));
        }
        // 1.2 bool -filter - 按照三级分类id查询
        if(searchParam.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",searchParam.getCatalog3Id()));
        }
        // 1.2 bool - filter - 按照品牌id进行查询
        if(searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",searchParam.getBrandId()));
        }
        // 1.2 bool -filter - 按照所有指定的属性进行查询
        if(searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0){
            for (String attrStr : searchParam.getAttrs()) {
                //attrs=1_5寸:7寸&attrs=2_16G:8G
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                // attrs=1_5寸:7寸
                String[] s = attrStr.split("_");
                String attrId = s[0]; //检索的属性id
                String[] attrValues = s[1].split(":"); //这个属性检索用的值

                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                // 每一个需要检索的属性，都必须生成一个nested查询，多个检索属性一块查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery
                        ("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        // 1.2 bool -filter - 按照库存是否有货 进行查询
        if(searchParam.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",searchParam.getHasStock() == 1));
        }

        // 1.2 bool -filter - 按照价格区间
        if(!StringUtils.isEmpty(searchParam.getSkuPrice())){
            /**
             * 1_500 / _500 500_
             *
             *"range": {
             *             "skuPrice": {
             *               "gte": 0,
             *               "lte": 6000
             *             }
             *           }
             */
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = searchParam.getSkuPrice().split("_");
            if(s.length == 2){
                //区间 匹配
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length == 1){
                if(searchParam.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }

                if(searchParam.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }

            boolQuery.filter(rangeQuery);
        }

        //把以前的所有条件 都拿来进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        // 2.1 排序
        if(!StringUtils.isEmpty(searchParam.getSort())){
            String sort = searchParam.getSort();
            // sort=hotScore_asc/desc   热度评分
            String[] s = sort.split("_");
            SortOrder sortOrder = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0],sortOrder);
        }
        // 2.2 分页
        // pageNum:1 from:0 size:5 [0,1,2,3,4]
        // pageNum:2 from:5 size:5 [5,6,7,8,9]
        // from = (pageNum - 1) * size
        sourceBuilder.from((searchParam.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);
        //2.3 高亮
        if(!StringUtils.isEmpty(searchParam.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        /**
         * 聚合分析
         */
        // 1. 品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        // 品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        // TODO  1.聚合 brand
        sourceBuilder.aggregation(brand_agg);

        // 2. 分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        //TODO  2.聚合 catalog
        sourceBuilder.aggregation(catalog_agg);

        // 3. 属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");

        // 聚合分析出当前 attr_id 对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        // 聚合分析出当前 attr_id 对应的所有可能的属性值 attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);

        //TODO  3.聚合 attr
        sourceBuilder.aggregation(attr_agg);

        String s = sourceBuilder.toString();
        System.out.println("构建的DSL语句" + s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam searchParam) {
        SearchResult result = new SearchResult();

        // 1. 返回所有查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModels = new ArrayList<>();
        if(hits.getHits() != null && hits.getHits().length > 0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if(!StringUtils.isEmpty(searchParam.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }
                esModels.add(skuEsModel);
            }
        }
        result.setProducts(esModels);

        // 2. 当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();

            // 1.得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            // 2.得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations()
                    .get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            // 3.得到属性的所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations()
                    .get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());

            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);
        // 3. 当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            // 1.得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            // 2.得到品牌的名字
            String brandName = ((ParsedStringTerms) bucket.getAggregations()
                    .get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            // 3.得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations()
                    .get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        // 4. 当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");

        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            // 得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            // 得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        // =============以上从聚合信息中获取====================

        // 5. 分页信息 页码
        result.setPageNum(searchParam.getPageNum());
        // 5. 分页信息 总记录数
        long total = hits.getTotalHits();
        result.setTotal(total);
        // 5. 分页信息 总页码 计算 11/2 = 5......1
        int totalPages = (int)total % EsConstant.PRODUCT_PAGESIZE == 0 ?
                (int)total / EsConstant.PRODUCT_PAGESIZE : ((int)total / EsConstant.PRODUCT_PAGESIZE + 1);

        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        // 6.构建面包屑导航功能
        if(searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0){
            List<SearchResult.NavVo> collect = searchParam.getAttrs().stream().map(attr -> {
                // 1.分析每个attrs传过来的查询参数值。
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                // attrs=2_5寸:6寸
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if(r.getCode() == 0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {});
                    navVo.setNavName(data.getAttrName());
                }else{
                    navVo.setNavName(s[0]);
                }

                // 2.取消了面包屑后，我们要跳转到哪个地方， 将请求地址url里面的筛选条件去掉
                //拿到所有的查询条件，去掉当前
                String replace = replaceQueryString(searchParam, attr,"attrs");

                navVo.setLink("http://search.gulimall.com/list.html?"+ replace);
                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(collect);
        }

        //品牌 添加到面包屑导航功能
        if(searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");

            //TODO 远程查询所有的品牌
            R r = productFeignService.brandsInfo(searchParam.getBrandId());
            if(r.getCode() == 0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {});
                System.out.println(brand.get(0));
                StringBuffer buffer = new StringBuffer();
                String replace = "";

                for (BrandVo brandVo : brand) {

                    buffer.append(brandVo.getName()+";");
                    replace = replaceQueryString(searchParam,brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }
            navs.add(navVo);
        }
        // TODO 分类面包屑导航，不需要导航取消

        return result;
    }

    private String replaceQueryString(SearchParam searchParam, String value,String key) {
        String encode = null;
        try {
           encode = URLEncoder.encode(value,"UTF-8");
           encode = encode.replace("+","%20"); //如果有空格，浏览器对空格编码和java不一样
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String replace = searchParam.get_queryString().replace("&" +key+ "=" + encode, "");
        return replace;
    }


}
